MAX1737
Stand-Alone Switch-Mode Lithium-Ion Battery-Charger Controller
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Key Features
Applications/Uses
| Charging VIN (V) (max) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 4 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 3.5 |
Simplified Block Diagram
Technical Docs
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Sampling:
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Parameters
| Charging VIN (V) (max) | 28 |
| Max. ICHG (A) | 4 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 2 3 4 |
| Protected VIN (V) (max) | 28 |
| Charger (V) | 4 to 17.6 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | QSOP/28 |
| Budgetary Price (See Notes) | 3.5 |
Key Features
- Stand-Alone Charger for Up to Four Li+ Cells
- ±0.8% Accurate Battery Regulation Voltage
- Low Dropout: 98% Duty Cycle
- Safely Precharges Near-Dead Cells
- Continuous Voltage and Temperature Monitoring
- < 1µA Shutdown Battery Current
- Input Voltage Up to +28V
- Safety Timer Prevents Overcharging
- Input Current Limiting
- Space-Saving 28-Pin QSOP
- 300kHz PWM Oscillator Reduces Noise
- 90% Conversion Efficiency
Applications/Uses
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Notebook Computers
Description
The MAX1737 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter.
The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one to four by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the battery temperature is outside the acceptable range.
The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
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